Plumbs touch calibration API to the display manager

extensions/browser/api/system_display/display_info_provider.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_
 #define EXTENSIONS_BROWSER_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 61 matching lines @@
       const api::system_display::Insets& delta);
   virtual bool OverscanCalibrationReset(const std::string& id);
   virtual bool OverscanCalibrationComplete(const std::string& id);
 
   // Implements touch calibration methods. See system_display.idl. This returns
   // false if |id| is invalid.
   virtual bool TouchCalibrationStart(const std::string& id);
   virtual bool TouchCalibrationSet(
       const std::string& id,
       const api::system_display::TouchCalibrationPairQuad& pairs,
-      const api::system_display::Bounds& bounds);
-  virtual bool TouchCalibrationReset(const std::string& id);
-  virtual bool IsTouchCalibrationActive(const std::string& id);
+      const api::system_display::Bounds& bounds,
+      std::string* error);
+  virtual bool TouchCalibrationReset(const std::string& id, std::string* error);
+  virtual bool IsTouchCalibrationActive(std::string* error);
 
  protected:
   DisplayInfoProvider();
 
   // Create a DisplayUnitInfo from a display::Display for implementations of
   // GetAllDisplaysInfo()
   static api::system_display::DisplayUnitInfo CreateDisplayUnitInfo(
       const display::Display& display,
       int64_t primary_display_id);
 
  private:
   static DisplayInfoProvider* Create();
 
   // Update the content of the |unit| obtained for |display| using
   // platform specific method.
   virtual void UpdateDisplayUnitInfoForPlatform(
       const display::Display& display,
       api::system_display::DisplayUnitInfo* unit) = 0;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayInfoProvider);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_